Chair arm



FIG. 1 is a front perspective view of a chair arm embodying the present invention;

FIG. 2 is a left side view thereof, the right side being a mirror image thereof;

FIG. 3 is a front view thereof, the rear view being a mirror image thereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The dashed lines in FIG. 2 show environmental structure and do not form a part of the design sought to be patented. 

The ornamental design for a chair arm, as shown and described. 